Gas burner



Nov. 16, 1937. s HARPER 2,099,205

GAS BURNER Filed Dec. 26, 1933 vious burners this portion has beencooled by Patented Nov. 16, 1937 UNITED STATES PATENT OFFICE 8 Claims.

This invention relates to burners, and particularly to gas range burners of the round or ring style, and this invention may either be used with a single burner or double section type of burner where a simmer section is combined in a single unit with a large section burner. This invention also applies to a burner having a separable bumer center wherein or adjacent to which the burnor ports are formed.

In such burners the separable center is frequently made of die cast aluminum in order to manufacture such a part in a practical manner, and some provision must be made for keeping such a center below its melting point. The hottest portion of such a burner is at the burner ports at the outer rim of such a center, and in precontact of this rim or by contact of teeth formed on this rim with the lower and cooler. part of the burner. Such contact is uncertain both on account of slight irregularities in the mating parts and because in actual practice such burner center may not be tightly forced or screwed into place; consequently I have devised other more reliable means of cooling in this invention. Such method consists in the positioning and form of the teeth forming the burner ports whereby a large area is exposed to the cooling action of the gas flowing inside of the burner when the burner is in operation. Experiment proves that there may be greater cooling of the burner center in the present invention than in past forms where teeth in the burner center have contact with the lower member of the burner, even though there may be no contact of the rim of the burner center in the present invention with any other part of the burner.

Heretofore burners of the round corrugated port type have been made and used but in all practical forms which have come in general use it has been necessary to use a very small diameter of burner with a wide spreading flame when the burner is turned on full but with a very disadvantageous concentration of heat at a low burning flame. In these burners previously used, it has not been possible to devise a large burner having a proper wide distribution of heat at a low frying flame, at the same time a burner having central ports so as to avoid a cold central portion, at the same timea burner having the upper roof of the ports slanting at 45 or more to the vertical so as to be unlikely to clog from spillage, and at the same time a burner of this type in which the central ports when ignited will in turn ignite the ports of the outer section. This advantageous a horizontal plane and consequently liable to become clogged or filled with spillings or boilovers on the burners. This has also been overcome in one form of the hereindescribed invention.

It has not been considered possible on previous burners of the corrugated port style to provide a burner of the double section type having in the .unit a simmer section which may be burned independently of the remainder of the burner. It is by. the form, shape and arrangement of parts that I have devised the burner of this invention in which this may be accomplished, and as well I have devised a burner to overcome objections tas set forth in previous burners of this general ype. v r i 'I'he'object of this invention is to provide a large burner having only a moderate spread of flame at lull flame and consequently a burner in which there is a high efficiency and at the same time a burner which when having a reduced flame for frying, provides a wide spread of uniform heat.

Another object of this invention is to provide a burner 01' the type indicated in which there are central burner ports as well as an outer ring of ports thereby providing a burner of higher efflciency as well as a burner which eliminates a cold spot in the center of the flame.

Another object of this invention is to provide a burner or the corrugated port type in which the port area may be changed by the raising or low--' ering of the interior portion of the burner head.

Another object of this invention is to provide a round burner of the corrugated port type having ports in the center as well as in the outer ring in which all of the burner ports open on a vertical plane so that none of the ports are liable to closure from spillage.

Another object of this inventionis a round burner of the corrugated port type having two sections, a large section and a simmer section, where the simmer section is entirely separated from the outer section and consequently may be separately burned.

Another object of this invention is the provision of the double section burner having a practical means of enclosing each section as well as of separating each section from the other section.

Another object of this invention is to provide a double section round burner of the corrugated port type having a burner head portion separable from the mixing tube portion whereby this burner head portion may be made of different material more readily adapted thereto than the material commonly used and necessary for the mixing tube portion of the burner.

These and other objects of this invention will be more apparent from the following description and from the drawing in which:

Figure 1 is a plan .view of a burner made in accordance with this invention;

Figure 2 is a sectional elevation along the line 2--2 of Figure 1;

Figure 3 is a sectional plan along of Figure 2; and

Figure 4 is a sectional view in elevation along the line 4-4 of Figure 1.

Referring now to the drawing, in which like figures refer to like parts throughout the drawing, and to Figure 1 particularly, a burner is shown having a mixing tube portion M which in this form of this invention is a cored iron casting having therein a small mixing tube II and a large mixing tube l2, said mixing tubes running parallel and being separated at all points by a wall l3. The entrances to these mixing tubes have two holes l4 and i5 adapted for the usual double gas cock commonly known and in use, and which consequently is not shown or described in this specification. Said nozzle hole I4 is substantially in axial line with said mixing tube l2 and saidnozzle hole I5 is in substantially axial line with said smaller mixing tube 1 I. The entrance end of said mixing tubes casting ID has air entrance holes l6 and I1, shown by dotted lines, and said opening l8 allows admission of air in mixing tube l2 while said opening i'l allows admission of air to aforesaid mixing tube ll. At the opposite end of said mixing tube from said air openings l6 and [1, said mixing tubes diverge from one another, curving in circular fashion,

the line 3-3 but the large mixing tubecurves on a wider radius at I8 while the smaller mixing tube curves .on a smaller radius at IQ for purposes hereinafter described. The curved portions of said mixing tubes extend upward into a flat surface 20 in which surface both of said mixing portions i8 and 19 open for the greater part of their curv ing length. I

Bolts 2| and 22 are provided which pass through corresponding holes 23 and 24 in said mixing tube casting and project from the top of aforesaid flat surface 20. The projecting portion of said bolts 2| and 22 are tapped into a burner head 25 at points 26 and 21.

Said burner head 25 has a small circular chamber 28 and a large circular chamber 28. 'Said small burner chamber 28 is formed immediately above the'curving section [9 of the small mixing tube ii and said large burner chamber 29 is formed immediately above the curving portion l8 of the larger mixing tube i2. This burner head 25 has a fiat seating portion corresponding in diameter both external and internal to the flat portion 20 of the mixing tube casting having the curving portions [8 and I9. Said small burner chamber 28 has an opening along part of this circumference at least partiallyregistering with the opening in the surface 20 of the curving portion. IQ of the small mixing tube I I and the large burner chamber 29 has an opening partially around its circumference substantially registercenter.

ing with the opening into the seating surface 23 of the curving portion ll of the larger mixing tube l2. A gasket may be desirably used in said seating surface having suitable holes therein so as to allow free passage of gas from the mixing-tubes in the mixing tube casting ll into the corresponding chambers in the burner head 23.

This burner head 23 comprises an outer cylinder 3i and an intermediate cylinder 32 and an inner cylinder 33, all of said cylinders being connected by an end wall 34 which is in contact throughout the greater portion of its extent with the iieating surface 28 on the mixing tube casting 0.

The aforesaid intermediate wall 32 has a thread 38 tapped therein and into this thread there is screwed a burner center 38 having an externally threaded extension 31 with a thread thereon suited to engage the aforesaid thread 33 in the burner head 25. Said burner head center has an inner cylindrical surface 38 into which said inner cylinder 33 of the burner head 25 extends with a free but close fit whereby only immaterial gas leakage can take place between said parts. Said inner cylindrical surface 33 of the burner head 38 has formed therein a plurality of diagonal slots 39 opening in this cylindrical surface 38 and as well in the under side 48 of this burner head It can be seen that this under side 48 of said burner head center 38 forms the upper wall and closes the smaller annular chamber 28 in the burner head 28.

- Referring further to the burner head center 38 it can be seen that this part is in the form of a cone and as it extends upward its diameter increases. The outer diameter of said burner head center 36 is substantially in the form of a cylinder 4| and its cylindrical surface flts freely but closely within the outer cylinder 3| of the burner head 25. These cylindrical surfaces do not engage as there is an appreciable clearance between the two parts through which gas flows and consequently this clearance forms part of the port area of the burner. The outer cylindri- .cal portion 4| in the burner head center 38 has a plurality of burner port slots 42 therein which extend inward and downward and through the under surface 43 of the outer portion of said burner head center 38. Said under surface 43 extends between the outer wall 3i and the intermediate wall 32 of the burner head 25 and it thereby forms the upper closure of the larger chamber 28 of the burner head 25.

Referring now to the Figures 2 and 4 of the drawing, it can be seen that the burner head center 38 has a projecting seating ring 44 over the upper end of the intermediate wall 32 in the burner head 25. This seating ring 44 limits the extent to which the burner head center 38 may be screwed onto the threads and so limits the minimum opening of the slotted burner ports 39 in the center of the burner and as well the minimum opening of the slotted burner ports 42 in the outer diameter of the burner as will be apparent from the drawing. This projection 44 forms a perfectly tight seat against leakage of gas when it is bearing against the upper end of the intermediate wall 32. It can be seen from this description and from the drawing that the parts employed form two separate concentric chambers, each having slotted burner'ports through which the gas mixture flows to the outside of the burner chambers where it may be burned and consumed. Referring further to Figure 2, a lighter jet piece 44a is provided which is screwed or otherwise fastened directly into the bottom of the in- .ner chamber 28 of the burner head 25. Said lighter jet piece 44a has a central burner passage 45 which communicates with a horizontal passage 46, the one end of said passage 40 opening toward the centralhole 41 of the burner head 25 and other end of said passage 46 opening in the opposite direction and toward a tube piece 48 which in this form of this invention is formed as a portion of the burner head 25. Said lighter piece jet 44a has a slot 60 extending the entire length of the horizontal passage 46 as shown.

As to the operation of this invention, a gas valve is employed attached to a gas source of supply and this gas valve is not shown in this drawing as it is now commonly known and used. This valve has nozzles extending into the nozzle openings l4 and in the burner casting in. Gas may therefore be supplied by means of this gas valve into either or both of saidmixing tubes I I or l2 and such gas passes through the passages described and into the burner chambers 28 and 29 passing through the corresponding slotted ports 39 and 42 from which it burns in the usual manner. Gaseous fuel flowing from the chamber 29 into the slots 42 flows both upwardly along the inner cylindrical surface. of the outer wall 3! and diagonally outward along the under surface of the burner head center 36. As a consequence of this flow in both an upward and diagonal direction, the gas on issuing from the burner port 42, takes a direction midway between the direction of said two sur-' faces along which the gas flows, and as a consequence the burning gas from this port 42 takes a more upward direction against the vessel than in other burners of similar type. This in turn causes the burner of this invention to have a higher efficiency since the flame is burning nearer to the center of the vessel and consequently has a further travel against the vessel before it escapes into the atmosphere. At the same time this invention provides a burner of relatively larger diameter and consequently a burner having a more desirable wide-spread uniform heat on low flame than in previous burners having a corresponding flame action on. full flame adjustment.

It is obvious why the construction I have shown and the burner I have described provides a construction in which a greater area is possible in the corrugations making the burner ports. In the commonly used burner of the corrugated port style, the depth of the corrugation is limited by the practical depth that can be used for the width of a burner port. Too great a width of a burner port causes a back flash of the burner and consequently such depth is definitely limited. In the burner of this invention the burner port corrugation extends directly down into the burner chamber which chamber may be as large as necessary, and consequently there is no limit to the depth and consequently the area and cooling effect of the burner port corrugations. Other burners of this general style have the corrugations extending inwardly and with such inward extension of the corrugation they are definitely limited in length since at a certain distance the ports will run together.

The burner of my invention may also be constructed with burner ports of a depth running towards the center of the burner only about approximately equal to their width. The sufllciently large cooling area is then obtained by extending the corrugations a greater distance downward into the burner chamber, the possibilities of such construction being obvious from the description.

- In this application I have not described the function and operation of the lighter jet 44a or the lighter tube 48 in view of the fact that it is fully disclosed in my co-pending application, Serial No. 709,449, filed February 2, 1934, in which a complete description is given of both the parts and the operation.

While I have described more or less precisely the details of construction, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form and the proportion of parts and the substitution of equivalents as circumstances may suggest or render expedient without departing from the spirit or scope of my invention.

I claim:

I. A gas range burner having two mixing tubes, said mixing tubes leading to a burner means having two separate chambers therein, each of said tubes connecting to one of said chambers, one of said chambers surrounding a central hole in said burner means. the other of said chambers surrounding the first mentioned chamber, said burner means having a common wall separating said two chambers, said burner having a removable top substantially engaging said common wall separating said two chambers, said top engaging said burner means in addition at the outside of said burner means and at said hole, and of said three points of a substantial engagement of said burner top'with said burner means, the points of engagement around said central hole being at the lowest level and the point of engagement around the outer diameter of said burner being at the highest level of all three points of engagement.

2. A gas range burner having a mixing tube casting having two mixing tubes, said casting having a seating surface means in its upper side and having two openings in said seating surface means, one of said mixing tubes connecting with one of said openings and the other tube to the other of said openings, a burner head having two annular substantially concentric chambers therein separated by a wall common to both of said chambers, a seating surface means on the bottom of said burner head having two openings therein, said openings extending over portions only of the circumferential lengths of said chambers, one of said openings connecting to one of said chambers and the other opening to the other of said chambers, each of said chambers having burner port means leading therefrom, the said mixing tube casting and said burner head being fastened together at their respective seating surfaces, the openings in the seating surface of the casting at least partially registering with the openings in the seating surface of the burner head, said burner head having a central hole therethrough, one of said openings in the seating surface of said burner head being nearer said hole than the other of said openings.

3. A double gas range burner having a burner head with a burner head body part and a burner head center part, said body and said center parts forming the closing means of two concentric annularchambers, said center and said bodyparts each having three extending concentric substantially cylindrical surfaces, each of the cylindrical surfaces on one of said parts extending within the axial length of a cylindrical surface on the other part whereby said chambers are enclosed and separated from one another, said burner head center having ports leading from said chambers, the burner head body serving to partially define the eifective area of certain of said ports when the body part and center part are in assembled relation, and said two parts each having a seat, the engagement of said two seats limiting the extent to which part ofthe cylindrical surfaces extend within the other said cylindrical surfaces.

4. A gas range burner having a burner head comprising a burner head body part and a burner head center part, said body and said center parts forming the closing means of an annular chamber, said center and said body parts each havins two extending concentric substantially cylindrical surfaces, each of the cylindrical surfaces on one of said parts extending within the axial length of a cylindrical surface on the other part whereby said chamber is enclosed, the outer extending cylindrical surface on one of said parts having grooves which coact with the outer extending cylindrical surface on the other of said parts to form an outer series of burner ports, the outer cylindrical surface on said first mentioned part extending throughout the outer portion of said part, and said two parts each having a seat, the engagement of said two seats limiting the extent to which the cylindrical surfaces of one part extend within the axial length of the cylindrical surfaces on the other part, all of said burner ports opening from said chamber to the outer atmosphere with said seats in engagement, said seats having a smaller diameter than the cylindrical surfaces which coact to form said series of burner ports.

5. A domestic range gas burner comprising a base member having a plurality of passages therein, and a burner head therefor comprising a body portion mounted on said base member having an outer wall, an inner wall and an intermediate wall, said inner and intermediate walls being in spaced relation and concentric with each other and in spaced relation and concentric with said outer wail and in stepped relation with each other with respect to height, and

a burner head center in threaded engagement with said burner head bodyi'said burner head center having a plurality of upwardly inclined grooves on its outer periphery adjacent its upper edge and having a plurality of concentric downwardly extending surfaces on its under side adapted to coact with said outer and intermediate walls to form concentric chambers in said burner head, the inner surface of the outer wall of said body member cooperating with the grooves to form burner outer ports communicating with the outer of said chambers, the burner head center having a series of ports therethrough in communication with the inner of said chambers.

6. A domestic range gas burner comprising a base member having a plurality of passages therein, and a burner head therefor having an inner surface inclined downwardlyfrom the outer periphery toward the center, said head comprising a body portion mounted on said base member having an outer wall, an inner wall and an intermediate wall. said innerand intermediate walls being in spaced relation and concentric with each other and in spaced relation and concentric with said outer wall and in stepped relation with each other with respect to height, and a burner head center in threaded engagement with said burner head body, said burner head center having a plurality of upwardly inclined grooves on its outer periphery adjacent its upper edge but terminating short of the upper edge thereof and having a plurality of concentric downwardly extending surfaces on its under side adapted to coact with said outer and intermediate walls to form concentric chambers in said burner head, the inner surface of the outer wall of said body member cooperating with the grooves to form burner outer ports communicating with the outer of said chambers, the burner head center having a series of ports therethrough in communication with the inner of said chambers.

PHILIP S. HARPER. I 

